package com.t18;


import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;

/**
 * Created by xuyiwei on 2018/9/2.
 */
public class BufferToText {
    private static final int BSIZE = 1024;
    public static void main(String[] args) throws Exception{
         FileChannel fc =
                new FileOutputStream("/Users/xuyiwei/Documents/javaBase/jdk/src/com/t18/TextFile2.txt").getChannel();
        fc.write(ByteBuffer.wrap("Some text11你".getBytes()));
        fc.close();
        fc = new FileInputStream("/Users/xuyiwei/Documents/javaBase/jdk/src/com/t18/TextFile2.txt").getChannel();
        ByteBuffer buff = ByteBuffer.allocate(BSIZE);
        fc.read(buff);
        buff.flip();
        // Doesn't work:
        System.out.print(buff.asCharBuffer());
        // Decode using this system's default Charset:
        buff.rewind();
        String encoding = System.getProperty("file.encoding");
        System.out.println("Decoded using " + encoding + ": "
                + Charset.forName(encoding).decode(buff));
        // Or, we could encode with something that will print:
        fc = new FileOutputStream("/Users/xuyiwei/Documents/javaBase/jdk/src/com/t18/TextFile2.txt").getChannel();
        fc.write(ByteBuffer.wrap(
                "Some text你".getBytes("UTF-16BE")));
        fc.close();
        // Now try reading again:
        fc = new FileInputStream( "/Users/xuyiwei/Documents/javaBase/jdk/src/com/t18/TextFile2.txt").getChannel();
        buff.clear();
        fc.read(buff);
        buff.flip();
        CharBuffer charBuffer = buff.asCharBuffer();
        while (charBuffer.hasRemaining()){
            System.out.print(charBuffer.get());
        }
        System.out.println(buff.asCharBuffer());
        // Use a CharBuffer to write through:
        fc = new FileOutputStream("/Users/xuyiwei/Documents/javaBase/jdk/src/com/t18/TextFile2.txt").getChannel();
        buff = ByteBuffer.allocate(24); // More than needed
        buff.asCharBuffer().put("Some text你");
        fc.write(buff);
        fc.close();
        // Read and display:
        fc = new FileInputStream("/Users/xuyiwei/Documents/javaBase/jdk/src/com/t18/TextFile2.txt").getChannel();
        buff.clear();
        fc.read(buff);
        buff.flip();
        System.out.println(buff.asCharBuffer());
    }
}
